Time-varying Channel Estimation And Order-vector Key-extracting Algorithm For Wireless Relay Networks

Physical-layer security, emerging as a promising security scheme, has attracted much attention. In this thesis, an encryption key generation algorithm is suggested for multiple-relay networks against eavesdropping. The proposed algorithm is based on the parameters of the wireless channels between the relays nodes and the destination, which is unavailable for any eavesdropper. The secure performance of the proposed algorithm is also analyzed through mathematical derivation and simulation results. Moreover, time-varying channel estimation is considered in this thesis. The channel is depicted by complex exponential basis expansion model (CEBEM). Estimation algorithm is proposed to estimate some combined parameters, and the corresponding mean square error (MSE) and Cramer-Rao bound (CRB) are derived to evaluate performance of the suggested estimator. Based on these estimates, detection of the information symbols can be realized at the source nodes. Finally, simulations are provided to corroborate the proposed studies.